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International Journal on Algae
SJR: 0.219 SNIP: 0.261 CiteScore™: 0.24

ISSN Imprimir: 1521-9429
ISSN On-line: 1940-4328

International Journal on Algae

DOI: 10.1615/InterJAlgae.v15.i4.30
pages 331-354

Morphological Variability, Taxonomy, and Ecology of Species of the Complex Handmannia comta / H. radiosa (Bacillariophyta)

S. I. Genkal
I.D. Papanin Institute for Biology of Inland Waters of RAS, Settle Borok, Nekouz District, Yaroslavl Region 152742, Russia


The morphological study of 22 populations of the complex Handmannia comta (Ehrenb.) Kociolek et Khursevich / H. radiosa (Grunow) Kociolek et Khursevich from water bodies of different types, geographic location, and trophic status has shown a significant variability in the majority of quantitative (the valve diameter, size of central area, number of striae and marginal fultoportulae in 10 µm, number of satellite pores of central and marginal fultoportulae, number of thin costae in alveoli, number of rings of central fuloportulae, number of rimoportulae, number of punctuate rows in striae) and qualitative (the relief of central area, presence of granules on valve and branching costae among alveoli, arrangement of central processes and rimoportulae, size of alveoli, orientation of rimoportulae slit) morphological characteristics (19) and their overlapping. The obtained results have allowed the author to add to information on H. comta) of H. comta, refer H. radiosa and Cyclotella balatonis Pant. to its synonymy as well as specify the ecology and distribution of H. comta.